[Draft] [Experiment] - Optimize PR AAD setup reuse

[mikaelweave]

Summary

• Remove current PR AAD deletion from the PR setup hot path while keeping explicit cleanup flows intact.
• Add timing around AAD setup pipeline and script sub-steps, and skip module installs when modules are already available.
• Preserve AAD user/client secrets when existing Key Vault secrets match desired state, including client credential key-id validation.

Validation

• PowerShell parser checks for FhirServerRelease and FhirServer scripts
• AAD setup inline script parser check
• git diff --check
• Static assertions for cleanup removal, timing/module helpers, and desired-state secret handling

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.33%. Comparing base (ee554e9) to head (ccfb076).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5591      +/-   ##
==========================================
- Coverage   77.33%   77.33%   -0.01%     
==========================================
  Files         996      996              
  Lines       36534    36534              
  Branches     5538     5538              
==========================================
- Hits        28255    28253       -2     
- Misses       6912     6913       +1     
- Partials     1367     1368       +1     

see 6 files with indirect coverage changes

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